Washing without water? Pets or small children come to mind, who often seem to share a common aversion against taking a bath. But, apparently, it also exists amongst motorcycles.
The idea behind 'washing without water'-products is that a dirty spot doesn't have to stress you out, or that there's no need to collect a phenomenal collection of dead insects on your bike during your week-long trip. No, now you can have a spotless bike without having to find a place to wash it.
Very convenient, this 'washing without water'. Fast too. And easy.